Knot-tying device



Sept. 1, 1936.

T. C. BROMLEY ET AL KNOT TYING DEVICE Filed May 28, 1955 2 a L 1: 0 af/fi Had Sheets-Sheet l p 1936- T. c. BROMLEY ET 2,053,062

KNOT TYING DEVICE Filed May 28, 1935 2 Sheets-Sheet 2 Patented Sept. 1, 1936 STATES ATENT ()FFIQE KNOT-TYING DEVICE Application May 28, 1935, Serial No. 23,912 In Great Britain June 1, 1934 13 Claims.

This invention relates to knot-tying devices of the type having a rotary tying head which includes a tying bill and such as are used in the textile and knitting arts for mechanically tying together the ends of threads, yarns and strands by a small knot, usually a knot of similar formation to a weavers knot.

The invention is mainly applicable to knottying devices, hereinafter termed knotters, of the hand-operated kind such as are carried upon one hand and actuated by a thumb lever or triger after thethreads, yarns or strands, hereinafter termed yarns, have been laid across the knotter in the yarn receiving guides thereof. The invention is not, however, limited in its application to hand-operated knotters as it may be embodied in or applied to a, mechanically-actuated knotter.

In knotters of the particular kind concerned the threads to be knotted together are laid by hand across the knotter and are received in open guide slots in the opposite side members of the device. Prior to the tying operation of the rotary tying head the threads require to be crossed in order that the bill of the tying head and the threads can become so related that one thread lies to the back and the other to the front of the tying bill with the two threads crossing each other on one side of the bill i. e. between the bill and the adjacent side of the device.

Moreover, in knotters of the particular kind concerned the knot after being tied by and about the tying bill is stripped 01f the bill by a stripper member which has associated with it a scissor device, said stripper and scissor device being movable relatively to the tying bill.

The principal object of the invention is to provide an improved knotter of the type referred to which will obviate the diificulties commonly experienced incidental to the preliminary crossing of the threads and will be capable of use in a Very simple manner not calling for any particular skill or more than ordinary care on the part of the operator.

A particular object of the invention is to provide a knotter of the type concerned in which the two yarns to be knotted upon being laid by the operator into open-ended slots in opposite sides of the device will become crossed in rela tion to the tying bill preparatory to being acted uponby the latter.

It is a further object of the invention to improve knotters of the kind concerned with a View to ensuring that the knot when stripped from the bill of the rotary tying head shall be clear of the bill, during the return motion of the tying head.

In the accompanying drawings,

Figure 1 is a side elevational view of the main part of a hand-operated knot-tying device ineluding examples of the improvements provided by this invention.

Figure 2 is a front end elevation of the same. Figure 3 is a view similar to Figure l but showing the opposite side of the device. 10

Figure 4 is a detail perspective view illustrating the threads to be joined laid across the knotter.

Figure 5 is a rear view of the device as viewed in the direction of the arrow in Figure 1 with the 15 threads laid across the mechanism as in Figure 4.

Figure 6 is a view similar to Figure 5 illustrating the initial rotation of the tying bill which brings the latter into contact with the threads.

Figure '7 is a detail perspective view illustrating the mechanism of the device in a subsequent stage of its operation and showing the clamping means acting upon the threads.

Figure 8 is a View similar to Figure 1, on a larger scale, illustrating the device with the plates'at one side'thereof removed and showing more particularly the improved scissor device and stripper.

Figure 9 is a similar view but showing the knotter at the end of its operation.

Figure 10 is a detail view representing the scissor device and stripper in end elevation.

Like parts are designated by similar reference characters throughout the drawings.

Referring to the drawings, 2 represents the rotary tying head which includes a tying bill 2a and 3, 3 the side members in which the front and rear receiving guide slots 4 and 4a respectively of the device are formed. 40

In the improved knotter according to a convenient embodiment of the invention, the axis of the tying head shaft 2b has an angular relationship to the guide slots 4, 4a of less than (for example about 45). Moreover, in relation to the bill 201. of the tying head 2, which normally occupies a downwardly turned position (for example about the four oclock position as shown in Figures 2, 4 and 5) the guide slots 4 and 4a in the sides 3 of the device are formed so that the threads are laid over the tying head, each thread a being supported at a higher point in one side than in the other the high point of support of one thread being in one side of the device and the high point of support of the other thread being in the other side of the device.

In each side of the device the two guide slots are substantially upright and open at the top for laying of the threads a, the slot 4 being situated in front of the slot 4a as hereinbefore stated. In the side of the device shown in Figure 1 the rear slot 4a is carried lower than the other and in the other side of the device the front slot ,4 is carried lower than the other. When the threads a are laid across the knotter the rear thread is laid in the rear guide slots 40. and the front thread is laid in the front slots 4. Viewed from above the knotter and looking down in the line of the slots the two laid threads are parallel or substantially so but, as owing to the different depth of the slots in the opposite sides'in which each thread is laid the rear thread is high in one side'and low in the other, while the front thread is low in the one side and high in the other viewed from the front (see-Figure 2) i. e. at right-angles to the guide slots, the two laid threads present a crossed appearance. 4

Now, the axis'of the tying head shaft 2b is at such an angle to the guide slots 4 and 40. that looking down upon the laid threads from above the knotter and at about right angles to the axis'of the tying" head 2 (see Figure 5) the two threadsare seen stretched across from side to side of the device in crossedrelation over the tying head with the bill 2a in such position that upon commencing to move upwards it canpass between the crossed threads, as represented in Figure 6, without any preliminary manipulation of said threads. That is'to'say, the threads a andbill 2a are so relatively positioned normally by the simple act of laying the threads across the device in the open slots that uponthe rotation of the tying head commencing, thetying bill can enter between the threads at'a'point between thatwhere'they are'crossed andthe adjacent side of the device, as clearly shown in Figure'fi. Advantageously, shown more clearly'in Fig-' Lire 4, .the guide slots are 'positioned'so that the rear threads when laid lies above and clear of the tyinghead 2 and the front thread when laid is situated in front of andclear of the rear thread and over but touching that side of the tying bill 2a which is presented uppermost when the bill is in the four oclock position. With this arrangement, when the tying head 2 commences to turn anticlockwise, the bill 2a at about the three oclock position gets in 'front of the front thread (see Figure 6), at about the two oclock position enters between the threads and at the twelve oclock position has the front thread passing behind it and the rear'threadon the front of it the said two threads crossing each 'otheron opposite, sides of the bill as seen when looking down upon the threads from above the knotter.

The improved knotter is arranged with the tying billlooking at the front of the deviceoccupying normally about the four oclock position and revolving anticlockwise. to form the knot. I v

The two threads are tensioned in the left side of the deviceas considered when regarding Figure 2, these being the threads which are tied (the ends in the right side being subsequently cut off) In the'arrangementshown for laying the two threads to be tied across from left to right i. e. with the ends in the right side of the knotter (looking at the front end) the bottom of the rear slot 4a in the left side is lower than the bottom of the front slot 4 in the same side (see Figure 1),

and the bottom of the rear slot 4a in the right side is higher than the bottom of the front slot 4 in this side, as represented in Figure 3.

The side of the knotter which holds the "two cut away after or when the knot is formed will be referred to as the out side.

It has already been stated that either side of the device may be made the tie side the other side being the out side.

Now, on the tying side of the tying head 2 the threads require to be held so thatthey'may be tensioned as the tying head operatesto tie the knot and for this purpose the improved knotter is furnished with means which tension the threads without however changing their position in the side in relation to each other or to the tying head; that is to say the threads are tensioned while they remain supported by the bottoms of the'guide slots in which they are laid. This'feature of the invention is carried out in the arrangement-shown in the drawings by making the tie sideof the knotter device two-walled and providing between thewalls 3a,, 3b a mechanically moved member having parts which when the member is moved pass across the guide slots and co-act with the'adjacent parts of the side walls and thus act upon the threads at in the guide'slots to clamp them lightly for tensioning purposes. One or each of the walls 3a, 3b is resilient or they are arranged to spring apart so that a yielding clamping action upon the threads between the said walls and member is providedthus obviating injury to the threads.

In the constructional example illustrated of this feature of the invention the tie side ofthe knotter'consists as stated of two plates 3a, 3b with a movable member 5 of thin plate-like form between them the outer plates 3a, 3b being held or pressedinto contact with the intermediate plate-like member 5 but capable of springing away from it; The said outer plates may be at tached by screws or 'rivets 6 to 'a body block I forming the centre part of the knotter device between the tie side and the out side. The intermediate plate-like member 5 is, as shown, in the form of a lever suitably. actuated and having parts 5a and 5b whichwhen the lever is in the normal position, shown more clearly in Figure 1, leave the guide Slots-whichare formed in both plates 3a, 3b constituting the tie side-open for the threads at to be'laid therein but which parts,

when the lever is actuated move across the slots so as to act on the threads at and nip or bend them between the plates to hold or tension the threads in the tie side of the device.

As will be seen the said lever 5 has a bifurcated end the opening which is normally in register with the long rear slot 4a in the tie side of the device and which bifurcation receives the rear thread when-this is laid in said slot. When the lever 5 is moved the bifurcation is moved out of register with the slot 4a and, as shown in Figure '7, thus clamps the threads (1 between the lever and adjacent plates 3a and 31). One side of the bifurcated'end of the lever 5, that is to say the part 5b of the latter, normally projects above the plates 3a and 3h or wall'of the tie side thus forming a portion separating the front slot 4 The plates from the rear slot 4a in the tie side. 3a and 3b in this case have a small rounded part 30 upstanding between the slots and the rear edge of the front slot 4 in each plate is notched at the bottom to receive the thread when it is pushed back by the action of the lever 5. The

7 a require to be changed in position during the tying operation and this may be-done by any suitable mechanical means.

For example, and as shown, the out side of the device is also composed in a similar manner to the tie side of two plates 3d and 3e but, as represented" more clearly in Figure 3, has two intermediate movable members one a pusher 8.for pushing the front thread. forward and the other a presser 9 for pressing the rear thread downwards as shown in Figure 7. The knotter is also provided with other elements for completing the knotting operation such as a rising and falling auxiliary scissor device and a tightening and stripper element of suitable form, and the various movable mechanical elements of the improved knotter may be actuated by any convenient means. The knotter has a thumb lever or trigger l6 which turns a spring-controlled semicircular member H mounted upon a transverse axis and having on one side and integral there'- with a toothed 'arcuate rack or sector Ha engaging teeth on. the tying head shaft 2b to rotate the latter. The knotter as hereinbefore described has a central body block 7 to which the sides are attached and in which the tying head shaft 2b is journalled; the said body block also carries the transverse axle lib on which the aforesaid semi-circular "member ll oscillates. The movable member 20 of the tying head is actuated by a vertical cam 2d attached to the body block I, and is controlled by a pin 2e fixed in the tying head upon which pin a slot 2) in the movable member works.

The pusher and presser members 8 and 9 respectively between the plates 3d and 3e of the out side are actuated from a rock lever !2 carried by the body block 7. The said rock lever is moved by a cam slot He in the semi-circular member I I which acts on a pin lZa on one end of the rock lever the opposite end of which latter has pivotally attached to it the rear end of the pusher member 8 which is a thin plate-like element having a forward notched end 8a and an upstanding limb 8b intermediate of its ends. The presser member 9 is a small rocker pivotally mounted by a pinv 90, on the inner plate 3e of the out side and having a hook-shaped front extremity or nose while its rear end is slotted. A pin on the side of the limb 8b of the pusher member 3 passes through the slot in the presser rocker and also through a slot 3] in the inner plate 82 of the out side. When the rock lever I2 is moved to push the pusher 8 forward the connecting pin Sc operates the presser rocker and rides along the slot 3 in the inner plate which slot and the arcuate movement of the rear end of the pusher member 8 determine the path of movement of the front notched end 8a thereof.

The thread tensioning lever 5 between the plates. to and 3b of the tie side is also moved by the above-mentioned pin l 2a on the'rock lever 12 from which the pusher and presser members are actuated.

When the parts described are in normal position as represented in Figure 3, the notch of the pusher 8 is in. register with or below the bottom of the front slot 4 in the out side and the hooked nose of the presser rocker 9 iswithdrawn behindthe rear edge ofthe rear slot 4a. It should be here mentioned that the guide slots 4 and 4a are formed in the outermost plate 3d only of the out side; the inner plate 36 of this side of the device has a little notch 3g formed in it at a point below the bottom of the rear slot 4a in the outer plate 3d while the portion 3h of the inner plate in front of the front slot 4 in the outer plate is cut away.

As will be seen, the upper open ends of the guide slots 4, 4a are flared or widened tofacilitate the laying of the threads 0, therein. Moreover, in order to prevent the threads from being laid in the wrong slots, a rigid right-angled extension Si is formed on the outer plate 3d between the slots 4 and do on the side of the device. In using the knotter described the two threads are laid across from left to right one in the rear pair of slots 4a and the other in the front pair 4, the tying bill occupying about a four oclock position as shown more clearly in Figure 4. All that the operator need do is to pull the threads down to the bottom of the slots which are straight and upright or mainly so in the device as represented in position for use.

As hereinbefore stated, it is also a feature of the invention that the usual scissor device, designated by I3, is carried independently of or separately from the stripper, designated by I4. In the example shown more clearly in Figures 8, 9 and 10, it will be seen that the scissor device is carried by a separate lever.

Describing the arrangement more fully, the bodily movable scissor device l3 (comprising three scissor blades two [3a of which are fixed and the other 31) is movable therebetween and relatively thereto) is carried by a lever I5 pivotally mounted on the central block or body portion '1 of the knotter which lever is disposed longitudinally and in a plane parallel to the axis of the rotary tying head 2. This lever I5 is situated in a. vertical plane towards one side of the knctter and at its front end it has an integral or rigid extension 15a at right angles to the main body of the lever and transverse to the axis of the rotary tying head (see Figures 2 and 10), which extension at its end remote from the lever has a downwardly extending part I5b forming an elongated lug disposed in a plane parallel to the main portion of the lever. To the outside of this lug the blades |3a of the scissor device I 3 are attached such as by a screw I30 and a pin i3cl so as to be stationary on the lugyand the blade l3b located between said blades I Be is adapted to turn on the said pin Nd and co-operate with the fixed blades for yarn-severing purposes. As will be seen the screw I30 is arranged so as to permit of adjustment of the angle of the fixed scissor blades 83a relatively to the movable blade L'ib. The fixed blades are, as shown, sprung into close contact with the movable blade. The front end of the lever i5 is so shaped that when it rises the lever will pass up on one side of the tying bill 212 and the scissor device i3 will pass up on the other side of the bill as seenin Figure 10.

At a suitable point between the fulcrum and the front end of the scissor lever i fi just referred to there'is pivotally mounted on the inside of said lever a second lever E6 the front end of which has a right-angled extension l6a. similar to and adapted to come on the inside of theextension to on the scissor lever. This second lever is the stripper lever and its right-angled extension has her-eon an upstanding finger 15b the upper prior to use, the

end lfid of the scissor lever.

end of which is hollowed, notched or hooked to engage one of the tied threads when the stripper rises. The end of the stripper lever extension 16a remote from the said lever terminates in a small lug I60 in the outside of which is fixed a pin or stud I6d engaging a slot is in the adjacent pivoted blade |3b of the scissor device on the extension l5a of. the other lever Hi. The upstanding finger lfib on the stripper lever extension 16a is disposed thereon so as to rise on the opposite side of the tying bill 2a to that where the scissor device is situated as represented in Figures 2 and 10. I

.The stripper lever I6 is pivoted l6?) for free rocking movement on the scissor-carrying lever l5 but such movement is controlled by a pin la fixed in the block or body portion 1 of the knotter at a suitable position in front of the fulcrum of the scissor lever. This'pin is engaged by the rear end of the stripper lever which end is slotted at Hie to slide on the fixed pin-as the levers rise and fall; this distance between the pivot of the stripper lever 16 on the scissor lever 55 and the fulcrum of the latter is greater than the distance between said pivot and the fixed pin Ia during any part, of the movement of the levers, consequently as the stripper lever i6 is carried and moved by the scissor lever l5, the former is caused to move relatively to the latter and the parts are so arranged that during the upward motion of the same the front end of the stripper lever 16 willrise quicker than the front end of the scissor lever l5. The relative movement between the stripper lever It and scissor lever l5 during the upward and downward movements of both is utilized by the pin and slot connection (ltd, I30) already referred to, to operate the movable blade I3b of the scissor device I3 the parts being so arranged that as the scissor device rises it closes and as it falls it opens. Figure 8 shows the scissor device in the fully open position whilst Figure 9 shows the same in the fully closed position. By the arrangementdescribed the stripper can be given a movement in excess of the associated scissor device for the purpose of effectively pulling the tied knot from the bill 2a and removing it to a remote position to be clear of the bill during return rotation of the tying head 2.

' As shown the rising and falling movements of the scissor lever I5 is imparted by the thumb lever or trigger lll of the knotter which, as hereinbefore mentioned, is integral with a springcontrolled semi-circular member or quadrant I! mounted upon a transverse axle in the knotter the said member having on one side thereof two pins lid and H e one lid normally situated in an arcuate open-ended slot [50 in the underside of the scissor lever and the other He appropriately positioned to pass, when the semi-circular member or quadrant H is turned, on the underside of the rear end l5d of the scissor lever and to engage with a notch '56 in the latter near the fulcrum to turn said lever and raise the front end.

The arrangement of the operating means just described is such that when the knotter is at rest -pin lid on the semi-circular member or quadrant ll occupies a normal position within the arcuate slot We of the scissor lever and thus holds the latter from turning movement on its fulcrum and the other pin He at this time is in a position rearward of the rear The said rear end of the leverwhich extends beyond the fulcrum is curved on its underside which curved part and the, aforesaid slot [50 are concentric with the axis of the semi-circular member or quadrant when the scissor lever 55 is in normal position as shown in Figure 8. and scissors are normally below the tying head 2.

Upon the thumb lever. if) being depressed the tying bill 21:. moves from normal position in an anticlockwise direction until on reaching the twelve'oclock position it has the two threads in.

the position previously described viz. the front thread at the back of the bill and. the rear thread on the front of the latter. Prior to this, how- As usual, the stripper ever, when the bill reaches about the three oclock position the aforesaid pusher 8 and presser 9 in the out side commence to operate, the former moving forward and the nose of the latter moving downward, which action continues until the tying .7

bill reaches about the six oclock position (see Figure 7) by which time the nose of the presser 9 has pushed the rear thread down into the little notch 30in the inner plate 3e on the out 'side and the notch 8a of the pusher 8 has pushed the front thread forward beyond the bottom of the guide slot 4. The latter part of the movement of the pusher is slightly upward as well as forward so that the notch 8a which acts on the thread 9 lifts the latter as well as pushes it forward. The pusher 8 and presser 9 having shifted their respective threads co-act with the adjacent plates 3d and 36 to hold or tension them.

Moreover, as soon as the bill 20. moves from the normal four oclock position the lever 5 between the. plates 3a and 3bof the tie side moves to tension the threads and by the time the bill has reached the nine oclock position (not shown) both threads are held or tensioned in the tie side. In Figure 7, the lever 55 is shown as coming into operation.

Upon passing from the nine oclock position the tying bill 20. enters between the two threads on the tying side at a point between the saidtie side and where the two threads are crossed and upon rising from the six oclock (Figure 7) to the second three o'clock position (not shown) the bill 211, the members or jaws of which are open, finds the threads on the cutting side presented in such a position by the aforesaid pusher 8 and presser 9 after their described movements that on rising "from the second three oclock position it can take the rear thread between its open jaws and bring the front thread onto the outside. front of the bill 2awhich relationship is attained at about the two oclock position. Rotation of'the tying head 2 continues and the scissor lever now commences to rise and as the tying bill nears the twelve oclock position the upstanding finger lllb on the stripper lever comes up under the. front thread on the tying side of the bill and gets 7 side and clamping the other end. As the bill 2a moves from the one oclock to the i2 oclock position the notched finger Nib of the stripper and the scissors l3 move higher with the result that the said finger pushes the front thread upwards thereby tighteningthe knot and moving it up the bill. At about the time that the bill reaches the twelve oclock position, the scissors l3 sever the front thread on the cutting side of the bill and the finger I61) completes its rise to pull the knot off the upper pointed extremity of the bill which on the completion of the operation, represented in Figure 9, is in about the ten oclock position after the tying head has made one and a half revolutions or thereabouts. As regards the operation' of the scissor device and stripping element, upon the semi-circular member or quadrant ll being turned by pressure. applied to the thumb lever or trigger It) thepin lld thereon moves down along the open ended slot l 50 in the scissor lever l and prior to its passage out of said slot the pin He assumes a position underneath the arcuate rear end I512 of the scissor lever and as the turning motion of the semi-circular member or quadrant continues, the pin lid passes out of the open. ended slot and the pin He follows the pin lid and passes along the concentric underside of the lever thereby preventing turning motion of said lever in one direction after the pin lid having left the slot has ceased to control it. Turning of the lever l5 in the other direction is prevented by a suitable abutment lb on the block or body portion? of the knotter. While 'thepin lie is moving under the concentric rear part l5d of the scissor lever I 5 the latter remains stationary but after a time the said pin strikes a projecting part on the underside of the lever near the fulcrum'and adjacent the notch l 56 and thereby turns the lever on its fulcrum thus elevating the stripper l4 and scissor l3. The armate underside of the rear end l 511 of the lever and -the aforesaid projecting part form a corner into which the pin passes and in this corner there is as aforesaid a notch or recess l5e with which the pin l le may engage and in which it may work as the lever turns on its fulcrum. As shown more.

clearly in Figure 9 the rise of the stripper is limited by a peg i if formed on the semi-circular member or quadrant which peg abuts against the block Jor body portionl of the knotter at the end of the operation of the latter. After the knot has been stripped from thebill the two threads 0. which have been tied remain held by the tension lever 5 in the guide slots 4, 4a in the tie side of the device but upon the thumblever H1 being released the spring returns the semi-circular member ,ll backwards thereby restoring'all the elements to normal position and releasing the threads which can be lifted out from the slots The. downward motion of the scissor lever I5 is effected by the pin lie on the semi-circular member or quadrant ll acting in the notch or recess I56 and against the arcuate rear portion l5ol of the.

lever which restores the latter to normal position and holds there until the pin llcl enters and assumes its original position within the open ended slot I50.

Referring again to the relative disposition of the thread receiving guide slots 4 and 3a and the *tying head 2 which is one of the distinguishing features of the invention, it may be stated that with the device in a position wherein the thread receiving guide slots are vertical as shown more clearly in Figure 1, the rotary tying head shaft 2b is disposed with its axis inclined downwardly and rearwardly from the tying bill end. A suit able angle of inclination for this axis is about 45 but this may vary. The tying bill is at about 90 to the tying head shaft as usual, consequently owing to the aforesaid inclination of the tying head shaft when the tying bill stands up in the twelve oclock position it is tilted or inclined backwards at about an angle of 45 to the vertical guide slots in the sides of the device. In the known forms of knotters of the kind concerned where the rotary tying head shaft is disposed horizontally the tying bill is parallel to the slots whenin the twelve oclock position.

In a knotter constructed according to the present invention the knotted yarns are free to be removed from the knotter immediately the stripping operation is completed and before the thumb lever or trigger is released. This is an advantage in-that it saves time and entirely precludes the possibility of the tied yarns becoming caught by the moving parts of the knotter as they return to their initial positions.

i What we claim then is:

- 1. In a knot-tying device, a rotary tying head which includes a tying bill, a scissor device, a stripper device for stripping the knot from the tying bill, one of said devices being carried by a lever pivotally mounted in the knotter, and the other device being carried by another lever mounted upon the first mentioned lever so as to enablediffer'ential movement to be effected between the scissor-device and the stripper device, means for moving the two devices in company, and means for effecting movement of the stripper device at increased speed in relation to the scissor device when the two devices are moved in company.

2. In a knot-tying device, a central body portion, a rotary tying head mounted in said body and having a tying bill, a lever carrying a scissor device, said lever being movable relatively to said bill and pivotally mounted on said body portion, means for operating said lever, a stripper lever carried by said scissor carrying lever and a control pin on the central body portion adapted to engage said stripper lever to effect a dirferential movement between the two levers when the scissor lever is moved for the purpose described.

3. In a knot-tying device, a central body portionfa rotary tying head mounted in said body and having'a tying bill, a lever carrying a scissor device which latter includes a movable slotted blade, said lever being pivotally mounted on said body portion in a plane parallel to the axis of the tying head, means for operating said lever, a stripper lever carried by said scissor carrying lever, a pin on said stripper lever adapted to engage the slot in the movable blade of thescissor device, and a control pin formed on the central body portion and arranged in such relation to the scissor lever fulcrum as to engage said stripper lever and effect a difierential movement between the two levers, such movement being utilized toactuate the said movable scissor blade.

4. In a knot-tying device, a central body portion, a rotary tying head mounted in said body and having a tying bill, a main operating member pivotally mounted in said body and adapted to rotate the tying head, a lever carrying a scissor device which latter comprises fixed blades and a relatively movable slotted blade said lever being pivotally mounted on said body portion in a-plane parallel to the axis of the tying head, a stripper lever carried by and pivoted upon said scissor carrying lever, a. pin on said stripper'leveradapted to engage the slot in the movable blade of the scissor device, a control pin arranged in the central body portion so as to engage said stripper lever and effect a differential movement between the two levers, which movement also actuates the said movable scissor blade, and means on the main operating member for controlling and eifecting the movement of said scissor carrying lever.

5. Akno't-tyin'g device comprising in combination. a central body block, two side members attached to said blockand each comprising two plates adapted to spring away from each other, two substantially straight guide slots being formed in each side member ofv the device to receive the threads to be tied, the bottom of one of said: slots in each side member being lower both than the other slot in the same member and'than the oppositeslot in the other side member, a rotary;tying head located between said members in an inclined position relatively to said slots, a tying bill on said head normally occupying-a downwardly turned position, an intermediate plate-like member mounted to move between the twoQplates of the member at one side of'the'body block andhaving parts which when said intermediate member is moved pass across the guide slots at that side and co-act with the adjacent parts of-the plates to clamp the threads lightly for tensioning purposes during the tying operation without however changing their position' in relationto, each other and to the tying head,;a pusher ,member and a presser member mounted to move between the plates of the other:

side member for changing the positions of the threads during the same time, means for operating the clamping member and the pusher and presserimembers, a stripper member for stripping-the knot from the tying bill, a scissor device carried independently of the stripper, and meansfor operating the stripper member and the scissordevice in such a manner that when the two are moved in company the former is moved at an increased speed relatively to the latter. 7

In a knotetying device, a rotary tying head, which includes a tying bill, a stripper member movable relatively to said bill and adapted to strip the knot from the latter, a scissor device associated with said stripper member but carried independently thereof, means for moving said scissor member, at an increased speed relatively to the scissor device during ;the movement of the scissor device and stripper member in company for cutting purposes and for stripping the knot from the bill.

,7. VA knot-tying device comprising, in combina-.

tion, a central body portion, a side member at each side of said body; portion, each .of said side members having two guide slots therein to receive the threads to be tied, the bottom of one of said slots in each side member being lower than the opposite slot in the other side member, a rotary tying head located between said members and inan inclined position relativelyto said slots, a tying bill on said head normally occupying a downwardly turned position, means for holding the threads at one side of theknotter to tension the same during the tying operation without, however, changing their positions in relation to each other and to the tying head, means at the other side of the device for changing the position of said threads during the same time, a lever carrying a scissor device, a stripper lever movable relatively to-the tying bill and having a part adapted to strip the knot from said'bill, said stripper lever being pivotedi for free rocking movement on the scissor-carrying lever, means for controlling and effecting movement of said scissor-carrying lever, and a control pin on the central bodyportion, said pin being arranged in such relation to the scissor carrying fulcrum as to engage said stripper lever. and effect a differential movement between the two levers when the scissor-carrying lever is moved for the purpose described. 7 V

8. :A knot-tying device, comprising two side members, each having two thread receiving slots therein, one of said slots in each side .memher being deeper than the other, and the deeper slot in one member being opposite the shallower slot in the other side member, a rotary head located between said side members and having a shaft which is obliquely disposed in relationto the guide slots and a tying bill on said head extenda ing at right angles to the tying head shaft and normally occupying a downwardly turned position.

9. A knot tyingdevice, comprising two side members, each having two thread receiving slots therein, one of said slots being deeper than the other, and the deeper slot in one side member being opposite the shallower slot in the other member, a rotary head located between said sider members andhaving a shaft whichis obliquely disposed in relation to the guide slotsand a tying bill on said head extending at right angles to the tying head shaft and normally occupying a downwardly turned position, said slots being so disposed relatively to the tying head that the threads to be tied may be laid thereinin crossed relation, transversely to the axis of the shaft in a direction at right angles to the slots. a

' 10. A knot tying device as set forth in claim 9, in which the shaft of the tying head has an angular relation to the thread receiving slots of the arrangement being such that when the threads to be tied are laid in the slots they may be extended in cross relation transversely to the axis of the tying head shaft.

11. A knot tying device, as claimed in claim 9 and having means for tensioning the threads on one side of the device during the tying of the knot, said means being arranged and adapted to yieldingly act. on said threads.

12. A knot tying device comprising two. side members each having'two thread receiving slots therein one of said slots in each member being deeper than the other, the deeper slot in one a member being opposite the shallower slot in the othermember, means, including a tying head for tying a knot in the threads and means on one side.

having on one side movable members adapted and operable to change the positionof the threads during the tying operation.

THOMAS CHARIES BROMLEY. GUY STORR HELLIWELL. 

